Op liquids and solids



Jan. 5 1926.

D. .1. sHAw APPARATUS FOR SCREENING SEWAGE AND OTHER MIXTURES OF LIQUIDSAND SOLIDS Filed June '15, 1925 3 Sheets-Sheet 1 Inventor Jan. 5 1925.1,568,572

D. J. SHAW APPARATUS FOR SCREENING SEWAGE AND OTHER MIXTURES OF LIQUIDSAND SOLIDS Filed June 4 15, 1925 5' Sheets-Sheet 2 Jan. 5 1926.1,568,572

D. J. SHAW APPARATUS FOR SCREENING sEwAGE AND OTHER MixTUREs oF LIQUIDsAND soLIDs Filed June 15, 1923 3 Sheets-Sheet 3 N/M 5mn w EAA/115 Emme?2Q Heretofore in such screens the elements y Patented' Jan. 5, 1926.

UNITI-:D STATES PATENT/ OFFICE..

DAVID J. SHAW, F NEWlYOBK, N. Y.

APPARATUS EUR SCREENING SEWAGE AND OTHER MIXTUBES OF LIQUIDS AND SOLIDS.

Application led June 13,

To all 'whom t may concern:

Be it known that I, DAvIoJ. SHAW, a citizen of the United States, andresident of New York, in the county of New York 5 and State of New York,have invented certain new and useful Improvements in Apparatus forScreening Sewage and Other Mixtures of Liquids and Solids, of which the'following is a specification.

This invention relates to screens of the inclined disk type such as areused in screening sewage and other liquids.

Y In the treatment of such liquids I have found that a rotating inclineddisk screen with or without a surmounted conical element, andautomatically and continuously cleaned by travelling brushes, can beused very effectively for the separation of solids from the liquid.

I discovered however thatexisting forms of such screens possess certaindefects which interfere with their satisfactory use in such service andresult in undue wear and de l preciation of the screening machinery.

have generally been carried on frames canti-j levered from a centralshaft and supported only or chiefly by such shaft.

The disadvantage of such support has been that since this type of screenis deL- signed for, and must necessarily work unkb der, an eccentricloading, the frame is sprung downward under its working load so that theopening at the periphery is spread to more than its designed width, andthus defeats the object of the screen, by permitting relatively largeobjects to pass through the widened openings.

A further disadvantage has been that hard objects, such as rags, sticksand .the like, have entered the widened opening-and, by friction, haveworn the edge of the .screen so that the peripheral opening has beenpermanently widened.

A still further disadvantage has been that the eccentric loading,combined with the distortion caused by the springing downward of theframe, have resulted in undue wear on the bearings of the screen and theconsequent seriousv shortening of the useful life of the apparatus.

Oneof the chief obstacles in eliminating bled, t

192s. serial No. 645,095.

the principle of the cantilever screen, and

the substition of a peripherally supported frame has been the difiicultyof devising a frame having peripheral and central sup-l ports and whichwould afford suflicient workable space for the attachment of radialmembers heavy enough to carry the necesp sary loads without using anundue weight of metal and incurring excessive cost.

It is an object of my invention to overcome these disadvantages byproviding a strong and rigid support which will prevent the springingdownwardof the frame and consequent widening of the peripheral openingand which will also avoid the eccentric strain and undue wear under theto provide an apparatus of the mentioned character which will be easilyand securely rotated, efficiently and constantly cleaned andconvenientlyadjusted to its best working position, by simple andeffective means.

With these and other objects in view, my invention consists in thearrangements and combinations of parts hereinafter more fully describedand specifically pointed out in the appended claims.

While I have perfected my invention foi` use in the treatment of sewage,I am aware that it is useful in screening other liquids containingsolids and hence I do not limit mfyself to processes involving thetreatment o sewage alone. I

In the accompanying drawings:

Fig. 1 is a longitudinal sectional view of my improved rotary sewa escreen, asseme section being ta en substantially on the line 1-1 of Fig.2.

Fig. 2 is a horizontal sectional view of my apparatus, the section beingtaken on the line 2-2 of Fig. 1.

Fig. 3 is a plan view of the screen proper, showing portions of theclosing ring applied therearound.

Fig. 4 is a cross sectional view of the assembled screen,

Fig. 5 is a sectional view of the running mechanism employed at theperiphery of the screen,

Figs. 6 and 7 are sectional elevation and plan View, respectively, ofthe adjusting mechanism employed in connection with the shaft of myscreen, while Figs. 8 and 9 are diagrammatic plan and sectional views,respectively, of an improved drive for my rotary screen.

Referring now more closely to the drawings, the numeral 10 indicates theinflow of the raw sewage 11 which will be screened and the solidcontents removed in the preferably circular basin 12. The screen 13 isapplied in said basin 12 in an inclined position, resting partly on theledge 14 at the periphery of it and partly on column 15, at the centerof the same. Rolling means 16 are interposed between the screen 13 andthe ledge 14 and pillar 15, respectively, while the periphery of thebasin 12 carries the closing ring or bridge member 17, cooperating withthe screen 13 and insuring that no liquid may pass from the inflowchannel 10 to the outflow channel 17 at the opposite end of the basin,except through the screen. A shaft 18 is applied to the center of myscreen, being fastened at the lower end to the pillar 15 and at itsupper end to the superstructure of my device, consisting of girders 1.9and bridge 20, resting on the concrete pillars 21.

My screen proper is preferably of a circular lat construction and mayhave a central truncated cone screenin element 22, superimposed thereon.The fgrame work of my rotatable and peripherally supported screencomprises a central hub structure 23 (Figs. 3 and 4) made of heavychannel iron, an outer ring 24, also made of channel iron, andequi-spaced radial I-beams 25, connecting said hub and the outer ring.Spacedly from the hub structure 23, the I beams 25 are rigidly held intheir equi-spaced positions by reinforcing members 26 arranged insubstantially circular order as shown. Screen elements proper 27 and 28are secured to the I-beams 25, reinforcing members 26 and to the innerand outer rings 23 and 24, respectively, and they may have furthersupporting members placed underneath them and secured into saidstructural elements. A circular plate 29 may cover the central portionof my screen structure and may be made with a central hub or bearing 30for the reception therethrough of a shaft, non-rotatable, whose upperand lower ends are secured in any suitable manner in the bridgestructure and the central concrete base mounted upon a ledge 34 (Fig.4), said ledge being preferably formed integral with the concrete wallof the basin 12. This ledge, it will be noted, is inclined towards theinlet channel 10, the degree of inclination being such as to incline theentire screen structure in the manner necessary to receive the incomingraw sewage 11 to the best advantage. Rollers 35 are placed between theconfronting heads of the rail rings 32 and 33, said rollers beingequi-spaced and each rotatably mounted on a pin 36, secured into andcarried by two concentric rings 37 and 38.

My screen structure 13 may easily rotate on rollers 35 and a toothedring 39 is secured to the periphery of the channel ring 24 in order toprovide means for rotating the screen structure. As best shown in Fig.1, the toothed ring 39 is in mesh with the gear 4() fast on shaft 41,operatively secured in casting 42 made fast in bridge 20. The shaft 41is driven from an electric motor 43 through the instrumentalities of abelt 44 and beveled gears 45 and 46.

As best shown in Fig. 4, I also may employ a central supporting rollerstructure similar to the one hereinbefore described and comprising therail shaped rings 47 and 48 between which are interposed the equispacedrollers 49, mounted on pins secured in two concentric rings as in theprevious instance. This central sup orting structure is located, it willbe note directly below the hub ring 23 and on top of a central concretepillar 15, built up in the center of the basin l2.

Thus mounted on outer and inner roller structures and inclined towardsthe incoming raw sewage, my screen structure receives and carries thesolid matter to its highest point where I locate a set of rotary brushes50, adapted to scrub my screen clean and to remove the solid mattertherefrom. Said rotary brushes 50 are arranged on the arms of a spider51, fast on shaft 41 and rotating therewith. The shafts of said brushes50 are further driven by gears in gear boxes 52, said gears receivingmotion through bevel gears 53, in mesh with stationary bevel gear 54,secured to the supporting casting 42, thus insuring a double rotation tothe brushes 50, first around the axis of shaft 41 and secondly, aroundtheir solid matter deposited thereon. Thescrub bing brush 58 may bedriven fromthe same electric motor 43 by the use of additional bevelgears 59, 60, 61, 62, 63 on shafts 64 and 65, and counter shaft 66, fromwhich motion is' transmitted to brush 58 through the gears 67 and 68.

In Figs. 6 and 7 I illustrate means whereby adjustably to center myscreen structure on its supporting tracks 1n relation to the circularrin bridge member 17. Here the lower end o shaft 18, instead of beingheld in a bearing as in Fig. `4, is held by three heavy set-screws 69,arranged at right angles thereto and threaded through the eyes of bolts70, set in the concrete pillar 15. In order to keep the set screws 69and the eye bolts 70 in an exact position while the concrete is fresh ornot set, I employ the heav cast iron ring 71, placed concentricallywith7 the shaft and receiving the set screws 69 through tapped holes 72.

In Figs. Sand 9, I illustrate diagrammatically an improved method fordriving my rotary screen. Screen 13 carries toothed ring 39 while Vtheouter ring 38 carrying the .rollers 35 (Figs. 5 @and 9) may have asimilar toothed rin 73 on its outer circumference. Both toot ed ringsare driven by the shaft 41`throug h the gears 40 and 74,

respectively. The rlng carrying the rollers being thus rotatedsimultaneously with the screen structure 13 in the same direction and inany desired speed relation thereto. To secure the desired s eed relationbetween the screen roper an the rings carrying the rollers and) also toarrive at the necessar reduction of speed from shaft 41, I pre erablyemploy the intermediate gears 75 and 76 to transmit motion to the screen13 and the roller ring 38, respectively. (Fig. 8.) The dotted circle 77and the arrow 78 represent the path and direction of rotation of brushes50. A l

Having thus described my invention, what I claim'as new and want toprotect by Letters Patent of the United States, is

1. In sewage treatment apparatus, the combination with a basin, formedwith an inclined interior support, of a pair of circular track railshavmg antifriction rollers therebetween, the lower one of said railsbeing arranged upon said support, a screen structure supported upon thetop track rail to turn therewith as,a unitary structure, and means .forimparting rotary movement to said screen structure.

2. Inv sewage treatment apparatus, the combination with a basin formedwith an inclined interior support, of a pair of circular track railshavvlng antifriction rollers therebetween, the lower one of said railsbeing arranged upon said support, a screen structure supported upon thetop track rail to turn therewith` as a unitary structure, a centralpillar in said basin having an in- .clined top, a second pair ofcircular track rails having antifriction rollers therebetween, saidscreen structure being further supported by the top rail f said secondpair of rails, and. meansforimparting rotary movement to said screenstructure.

3. In sewage l treatment apparatus, the combination with a basin formedwith an inclined internal support, of a pair of cir cular trackV railshaving antifriction rollers disposed therebetween the lower one of saidrails being arranged upon said support inclined therewith, a toothedring mounted upon the top track rail, a screen structurek supported atits rim upon said toothed ring, said top rail, toothed ring and screenstructure being rotatable as a single structure upon the antifrictionrollers, and means engaging said toothed ring for imparting rotarymovement thereto.

4. In sewage treatment apparatus, the combination with a basin formedwith an inclined interior support, and a central pillar, of a pair oftrack rails havingantifriction rollers therebetween the lowerone ofsaid'rails being arranged upon said support inclinedly therewith, atoothed ring mounted upon the top track rail, a wheelshaped framework'supported at its rim upon said toothed ring and provided with a centralhub, com rising a bearing screen element arranged between the spokeelements of said framework, an overhead beam,

eol

and a shaft extending through said bearlholding said antifrictionrollers in equispaced relation, a screen structure supported a T uponsaid top rail to turn therewith as a unitary structure, and means fordriving said screen structure 'and said roller connected vst-ructureindependently of each other. f s

6. In sewage treatment apparatus, the

combination with a basin formed with an inclinedinterior ledge, of aair-,of circular track rails the lower one o said rails being mounted onsaid ledge inclinedly therewith and said rail being arranged over oneanother with antifriction rollers engaged therebetween, concentric ringplates connecting and holding said anti-friction rollers in spacedrelation, the outer ring plate being toothed, a toothed ring mountedupon the top track rail, a screen structure supported at its rim uponsaid toothed ring, means in connection with said outer ring plate fordriving the connected rollers as a unitary structure, and meansconnected with the toothed ring for driving the same in conjunction withthe top track rail and ,the screen-structure as a unitary construction.

7. In a sewage treatment apparatus, the combination with a basin formedwith an inclined interior ledge and an inflow opening through the wallof said basin above said ledge, of a pair of circular track rails thelower one of said rails being mounted on said ledge inclinedly therewithand said rails being arranged one over the other with antifrictionrollers therebetween, a ring connected with and holding saidantifriction rollers yin spaced relation, a screen structure supportedupon said top rail to turn therewith and rovided with a centrall111b`constituting a caring, a pillar rising centrally from said basin,an overhead beam, a shaft extending through said bearing and having itstop end engaged in said beam and its bottom end adjustably connectedwith said pillar whereby to adjust said ring connected rollers and suported structure relatively to the substantia y circular opening formedby said ledge.

8. In sewage treatment apparatus, the combination with a basin formedwith an inclined interior support and an inflow opening through the wallof said basin above said support, of a pair of circular track rails thelower one of said rails being mounted on said support inclinedlytherewith and said rails being arranged one over the other withantifriction rollers therebetween, a ring connected with and holding1said antifriction rollers in spaced relation, a screen structuresupported upon said top rail to turn therewith and -provided with acentral hub constituting a bearing, a pillar rising centrally fromvsaidbasin, an overhead beam, a shaft extending through said bearing andhaving its top end engaged in said beam and its bottom end adjustablyconnected with said pillar whereby to adjust said ring connected rollersand supported structure relatively to a substantially circular openingformed by a closing ring member on the wall of said basin bridging theopening between said wall and the rotating structures.

9. In sewage treatment apparatus, the combination with a basin formedwith an inclined interior support, of a circular track rail mounted onsaid support, anti-friction rollers supported by and travelling on saidcircular track, a second circular` track rail supported by andtravelling on said anti-friction rollers, a screen structure supportedon the top track rail so as to turn therewith as a unitary structure,and means for imparting rotary movement to said screen structure.

Signed at New York, in the county of New York and State of New York,this 11th day of June A. D. 1923.

DAVID J. SHAW.

